After having looked long enough between the philosopher’s lines and fingers, I say to myself: by far the greater part of conscious thinking must still be included among instinctive activities, and that goes even for philosophical thinking. We have to relearn here, as one has had to relearn about heredity and what is “innate.” As the act of birth deserves no consideration in the whole process and procedure of heredity, so “being conscious” is not in any decisive sense the opposite of what is instinctive: most of the conscious thinking of a philosopher is secretly guided and forced into certain channels by his instincts. (Walter Kaufmann, translator)

Or, to put it another way, our conscious awareness is but the tip — the sensitive tip? — of a cognitive iceberg: most cognition is beyond conscious control, and just beneath cognitive awareness.